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Investments - Schedule of Fair Value of Assets and Financing Liability on Total Investments (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Amortized Cost
Fair Value Of Financial Instruments [Line Items]
Total cash equivalents and investments	$ 154.9	$ 160.4
Less cash equivalents	(51.8)	(23.8)
Total Investments	103.1	136.6
Amortized Cost | Commercial Bonds and Paper | Fair Value, Inputs, Level 2
Fair Value Of Financial Instruments [Line Items]
Total cash equivalents and investments	66.8	115.2
Amortized Cost | Money Market Funds | Fair Value, Inputs, Level 1
Fair Value Of Financial Instruments [Line Items]
Total cash equivalents and investments	51.8	21.3
Amortized Cost | U.S. Treasuries | Fair Value, Inputs, Level 2
Fair Value Of Financial Instruments [Line Items]
Total cash equivalents and investments	36.3	23.9
Gross Unrealized Holding Losses
Fair Value Of Financial Instruments [Line Items]
Total cash equivalents and investments	1.2	0.3
Total Investments	1.2	0.3
Gross Unrealized Holding Losses | Commercial Bonds and Paper | Fair Value, Inputs, Level 2
Fair Value Of Financial Instruments [Line Items]
Total cash equivalents and investments	0.6	0.2
Gross Unrealized Holding Losses | U.S. Treasuries | Fair Value, Inputs, Level 2
Fair Value Of Financial Instruments [Line Items]
Total cash equivalents and investments	0.6	0.1
Estimated Fair Value
Fair Value Of Financial Instruments [Line Items]
Total cash equivalents and investments	153.7	160.1
Less cash equivalents	(51.8)	(23.8)
Total Investments	101.9	136.3
Estimated Fair Value | Commercial Bonds and Paper | Fair Value, Inputs, Level 2
Fair Value Of Financial Instruments [Line Items]
Total cash equivalents and investments	66.2	115.0
Estimated Fair Value | Money Market Funds | Fair Value, Inputs, Level 1
Fair Value Of Financial Instruments [Line Items]
Total cash equivalents and investments	51.8	21.3
Estimated Fair Value | U.S. Treasuries | Fair Value, Inputs, Level 2
Fair Value Of Financial Instruments [Line Items]
Total cash equivalents and investments	$ 35.7	$ 23.8

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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(1))
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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